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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ce82a3f1a5f684530bad9261a06960cd63060aca714cf6a600a73c9f64f31e' 
  AND token = 'TJPSdYn4PkMYwPY7OfD7lNLx82D2vgW1AdZKw45XC3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}